웃음

The act of laughing or smiling, the way one laughs or smiles, or the sound that one makes when he/she laughs.

웃음을 날리다

To wear a smile.

To be teased or mocked by others.

To work at a bar serving guests of the opposite sex to make money.

An expression to describe a situation where something goes well at first but ends up with a negative result or in a tragedy.